Convert 3 6/2 to an improper fraction so: 12/2 convert 2 4/5 to 14/5 multiply the numerators of the improper fractions so 12*14, which is 168. multiple the denominators so 2*5, which is 10. the new fraction is 168/10, so you divide 168 divided by 10, which is 16.8, or 16 4/5.
So to get the answer, we just add the number of bones in your hands and bones in your skull 1/4 (bones in hands) + 1/10 (bones in skull) we can only add fractions that have the same denominator (bottom number in a fraction) so we change the numbers to have a common denominator: 5/20 + 2/20 = 7/20 so 7/20 of your bones are in your hands or skull